Searches for squarks and gluinos at D0

TL;DR

This paper reports on searches for squarks, gluinos, and scalar top quarks at the Fermilab Tevatron, finding no evidence of these particles and setting mass limits based on the analyzed collision data.

Contribution

First comprehensive search for squarks, gluinos, and scalar top quarks at Tevatron using multiple decay channels and setting new mass exclusion limits.

Findings

No excess signal observed above background

Upper mass limits set for squarks and gluinos

Data analyzed corresponds to up to 2.1/fb luminosity

Abstract

Recent results obtained by the D0 Collaboration on searches for squarks and gluinos in proton-antiproton collisions at sqrt(s) =1.96 TeV at the Fermilab Tevatron collider are discussed. For the inclusive searches, events with multiple jets of hadrons and large missing transverse energy in the final state are studied within the framework of minimal supergravity and assuming R-parity conservation. Searches for the scalar top quark are studied in two final state topologies: with events of two charm jets and large missing transverse energy or leptons, jets and missing transverse energy. The data, corresponding to integrated luminosities of up to 2.1/fb, show no excess of a signal above the expected background in any of the decay channels examined. Instead, upper limits at 95% Confidence Level on the squarks and gluino masses are derived.